Improvement in elliptical springs for carriages



July 21, 1915.

DRAWING A careful search has been made this day for the original drawing or e phetolithographic copy ef the same,

for the purpose of reproducing the said drawing to form a part of this book, but at this time nothing can be found from which a reproduction can be made.

Finis D. Morris,

Chief of Division B.

UNITED STATES.

PATENT Orrtca.

FRANKLIN HATCH AND W. TERRY, or SOUTH CORTLAND, haw YonK.

IMPBGVEMENT IN ELLIPTICAL SPRINGS FOR CARRIAGES.

Specificationforming part of Letters Patent No. 1,230, dated July 10,1839.

Tooll whom it may concern:

I Be it known that we, FRANKLIN HA'roH and the following is a full and exact description.

- To enable othersskilled in-the art to make and use our invention, 'wewill proceed to describe its construction and operation.

known form, or form of the drawing; then measure from the center of the ear' or scrollat each end one-sixth. the length of thesprings. We then weld on ears tothe body-leaf, two at each end, one opposite the other; then drill them fora small rivet; then out and draw,

the middle leaves or those whosecurves are reversed from thecenter to the end a true taper to about one-thirdtheir original thickness,

leaving them the whole length their original width; then make a shoulder on both edges of the leavesvlthe thickness of the ear. Av

small scroll is then turned toward the center of the spring, the length ot' 'the leaves being two-thirds that of the body or long leaves from the center of each scroll. They are-then bent the exact shape} of the body for longleaves. The convex sides are then put together and fastened at the center with a'single bolt or rivet. Ihey are then put together, the scrolls put into the ears'and' riveted or bolted,'which constitutes the spring.

In making springs in the mannerherein described there is a reduction of nearly orquite one-third the quantity of steel for carrying the same weight by each part of the spring com- 7 ing onto the other in an elliptical form in the bearing, thereby making two complete elliptics, which causes a reacting or double repelling motion; but thegreatest improvement in them, and that which renders them superior, is' their increased elastic and resistant motion by 1 having each part of the spring detached from y We shape the body or' long leaves in the the oiher except at the bearing-points, and those being made to work on a roller or hinge, which prevents all friction and retardation of motion as is occasioned in the common, springs by having each part come in close and binding contact with the other. When the carriage meets an obstruction which causes the springs to be put in motion there is a continuation of contraction and expansion of the springs (which the other springs have not) until they come to an equilibrium, thereby no jolt or sudden motion being felt.

-What.\ve claim as our invention, and desire to secure by Letters Patent, i's- The addition of two leaves to the inside of an elliptic spring, (with the curves reversed,) in the manner herein described.

' FRANKLIN HATCH.

JONATHAN W. TERRY.

Witnesses: V

M. L. HOPKINS, CHARLES DE GROUT. 

